Exhaust muffler

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube including:
• an exhaust inlet end exhibiting a first diameter and configured to receive exhaust gases from said engine;
• an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter;
• and
• a wall portion having a plurality of holes for passage of said exhaust gases out of said tapered tube, each of said holes being an ellipse characterized by a major axis and a minor axis, said major axis being greater than said minor axis, and said major axis being substantially aligned with a longitudinal dimension of said tapered tube;
• and
• an outer tube axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer tube, said outer tube having an air inlet end and an air outlet end, said air inlet end being configured to receive air external to said engine to create a flow of said external air in said annular passage toward said air outlet end for accelerating the receipt of exhaust gases from said engine, said holes of said wall portion enabling said exhaust gases to mix with said external air flowing through said annular passage to said air outlet end.

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube having an exhaust inlet end exhibiting a first diameter and an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter, and said exhaust inlet end being configured to receive exhaust gases from said engine;
• an outer tube axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer tube, said outer tube having an air inlet end and an air outlet end, said air inlet end being configured to receive air external to said engine to create a flow of said external air in said annular passage toward said air outlet end for accelerating the receipt of exhaust gases from said engine;
• and
• a straight tube of substantially invariant diameter coupled to said exhaust inlet end of said tapered tube, said straight tube being axially aligned with said tapered tube.

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube having an exhaust inlet end exhibiting a first diameter and an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter, and said exhaust inlet end being configured to receive exhaust gases from said engine;
• a straight tube of substantially invariant diameter coupled to said exhaust inlet end of said tapered tube;
• and
• an outer tube axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer tube, said outer tube extending upstream from said exhaust inlet end of said tapered tube to surround a section of said straight tube, said outer tube having an air inlet end disposed proximate said exhaust inlet end of said tapered tube and an air outlet end disposed proximate said exhaust outlet end of said tapered tube, said air inlet end being configured to receive air external to said engine to create a flow of said external air in said annular passage toward said air outlet end for accelerating the receipt of exhaust gases from said engine.

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube having an exhaust inlet end exhibiting a first diameter and an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter, and said exhaust inlet end being configured to receive exhaust gases from said engine;
• an outer tube axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer tube, said outer tube having an air inlet end and an air outlet end, said air inlet end being configured to receive air external to said engine to create a flow of said external air in said annular passage toward said air outlet end for accelerating the receipt of exhaust gases from said engine;
• and
• a reducing bell coupled to said air inlet end of said outer tube for receiving said external air and communicating said air to said annular passage.

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube including:
• an exhaust inlet end exhibiting a first diameter and configured to receive exhaust gases;
• an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter;
• and
• a wall portion located between said exhaust inlet end and said exhaust outlet end, said wall portion having a plurality of holes;
• and
• an outer tube axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer tube, said outer tube having an air inlet end proximate said exhaust inlet end and an air outlet end proximate said exhaust outlet end, said air inlet end being configured to receive air external to said engine to create a flow of said external air in said annular passage toward said air outlet end to mix with said exhaust gases flowing from said holes.

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube including:
• an exhaust inlet end exhibiting a first diameter and configured to receive exhaust gases;
• an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter;
• and
• a wall portion located between said exhaust inlet end and said exhaust outlet end, said wall portion having a plurality of holes, each of said holes being an ellipse having a major axis and a minor axis, said major axis being greater than said minor axis, and said major axis being substantially aligned with a longitudinal dimension of said tapered tube;
• and
• an outer tube axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer tube, said outer tube having an air inlet end proximate said exhaust inlet end and an air outlet end proximate said exhaust outlet end, said air inlet end being configured to receive air external to said engine to create a flow of said external air in said annular passage toward said air outlet end to mix with said exhaust gases flowing from said holes.

An exhaust muffler for an internal combustion engine comprising:

• a tapered tube including:
• an exhaust inlet end exhibiting a first diameter and configured to receive exhaust gases from said engine;
• an exhaust outlet end exhibiting a second diameter, said second diameter being less than said first diameter;
• and
• a wall portion located between said exhaust inlet end and said exhaust outlet end, said wall portion having a plurality of holes;
• and
• an outer reducing tube removably secured to said tapered tube, said outer reducing tube being axially aligned with and surrounding said tapered tube to form an annular passage between said tapered tube and said outer reducing tube, said outer reducing tube including:
• an air inlet end proximate said exhaust inlet end and exhibiting a first tube diameter for receiving air external to said engine to create a flow of said external air in said annular passage;
• and
• an air outlet end proximate said exhaust outlet end and exhibiting a second tube diameter, said second tube diameter being less than said first tube diameter, said outer tube extending downstream from said exhaust outlet end of said tapered tube to form a low pressure region delineated by said exhaust outlet end, said air outlet end, and said inner surface for accelerating the receipt of said exhaust gases from said engine.